Installation guide

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Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 3 Installing the IGX
Installing Voice Cards
Connecting a UVM to T1 Lines
Voice or data connections on a T1 line use the UVM front card and the BC-UVI-2T1EC back card. The
procedure for connecting the T1 lines is as follows:
Step 1 Bring each cable through the opening at the bottom of the cabinet (if applicable) and up the back of the
unit. Install optional Y-cables as needed. You can use the cable management feature to help route the
cables.
Step 2 If the intended compression for voice channels is LDCELP and the number of channels on a T1 line
exceeds 16, install cabling for pass-through. Note that the UVM does not pass-through t-type or td-type
connections. For the steps that follow, refer to Figure 3-9 for an illustration of the possible UVM cabling
arrangements. Note that, in Example B, the number of channels has not exceeded the UVM capacity, so
pass-through is unnecessary.
• On port 1 of the primary UVM, connect the cable to the CPE.
• On port 2 of the primary UVM, connect the cable to port 2.
• Connect the cable from port 2 of the primary card to either port 1 or port 2 of the secondary UVM.
Typically, if the secondary UVM is supporting the passed-through channels from only one primary
UVM, you would connect the cable from port 2 of the primary card to port 1 of the secondary card.
However, because the secondary UVM can receive 16 passed-through channels with LDCELP
compression, you can pass 8 channels each from other UVMs.
• If the secondary UVM is supporting an additional 8 channels with LDCELP, connect the cable
between port 2 of the secondary UVM and the other primary UVM.
For a description of the pass-through feature, refer to the Cisco IGX 8400 Series Provisioning Guide.
Record the back slot number and port number of each line. These numbers are necessary for configuring
the system after you complete hardware installation.